Connected: An Internet Encyclopedia
RFC 1123 - 6.1.2.3 Unused Fields: RFC-1035 Section 4.1.1

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### 6.1.2.3 Unused Fields: RFC-1035 Section 4.1.1

Unused fields in a query or response message MUST be zero.

Next: 6.1.2.4 Compression: RFC-1035 Section 4.1.4

Connected: An Internet Encyclopedia
RFC 1123 - 6.1.2.3 Unused Fields: RFC-1035 Section 4.1.1